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Forecast and observation data come from the National Weather Service (NWS), part of NOAA. That includes grid-based forecasts, current conditions, and Area Forecast Discussions. We present that data in a readable layout and add plain-language summary briefings on top.
No. WxYapper summaries are interpretive planning briefings based on official NWS data. They are not a substitute for official NWS forecasts, watches, warnings, or advisories. During severe weather, always follow instructions from the National Weather Service and local emergency officials.
Grid forecasts and current conditions refresh as new NWS data becomes available. Structured summaries are regenerated when the Area Forecast Discussion for your forecast office is updated. You may see a brief "Updated just now" indicator when a new summary arrives.
Summaries are generated once per NWS forecast office and shared across ZIP codes in that office's coverage area. Your city name is personalized when you view a forecast, but the underlying briefing may be similar for nearby locations served by the same office. Hourly and daily grid data are still location-specific.
Main concern highlights the biggest weather-related planning risk for the day—such as heat, storms, wind, or flooding—when the summary identifies one. If conditions look benign, it may show as none or be omitted.
Best outdoor window suggests the most comfortable remaining time period today for outdoor plans (morning, afternoon, evening, or overnight), based on the summary. It only considers periods that have not already passed in your local time zone.
Weather evolves. When NWS meteorologists issue a new discussion or grid update, timing, temperature trends, and storm chances can shift. WxYapperreflects those updates in refreshed summaries and grid tabs. The "What changed" section appears when a new summary notes meaningful differences from the prior briefing.
Do not rely on WxYapperalone. Monitor official NWS watches, warnings, and local emergency alerts. Use a NOAA Weather Radio, trusted local media, or your phone's wireless emergency alerts as appropriate for life-safety decisions.
See our guide to reading the forecast summary, the About page, or Contact if you have other questions.